The prosecutions can be handed out whatever the variable limit is. This ranges from 20mph (32km/h) to 70mph (112km/h) depending on congestion levels.

A Welsh Government spokesman said: “Although it is still relatively early days in terms of measuring the success of the system, it’s encouraging that compliance with the speed limits continues to improve, enabling the system to work as intended.”

The Welsh Government introduced the Variable Speed Limit (VSL) system in a bid to reduce congestion while improving road safety and journey time reliability.

According to GoSafe, when vehicles travel at consistent and similar speeds, journey times become more predictable.

Welsh Government’s economy and infrastructure secretary, Ken Skates AM, said the scheme, since its launch, has “helped improve traffic flow and reduced the number of accidents along this stretch”.

While he stressed that the “majority of drivers adhere to the limits in place” he added a “minority of drivers continue to flout the displayed limits and act as if the restrictions do not apply to them.”